diff --git a/crates/rbuilder/src/building/builders/block_building_helper.rs b/crates/rbuilder/src/building/builders/block_building_helper.rs
index 5f5fbbb7..7342fdd1 100644
--- a/crates/rbuilder/src/building/builders/block_building_helper.rs
+++ b/crates/rbuilder/src/building/builders/block_building_helper.rs
@@ -76,6 +76,10 @@ pub trait BlockBuildingHelper: Send + Sync {
 
     /// Updates the cached reads for the block state.
     fn update_cached_reads(&mut self, cached_reads: CachedReads);
+
+    /// Name of the builder that pregenerated this block.
+    /// BE CAREFUL: Might be ambiguous if several building parts were involved...
+    fn builder_name(&self) -> &str;
 }
 
 /// Implementation of BlockBuildingHelper based on a generic Provider
@@ -422,4 +426,8 @@ where
     fn update_cached_reads(&mut self, cached_reads: CachedReads) {
         self.block_state = self.block_state.clone().with_cached_reads(cached_reads);
     }
+
+    fn builder_name(&self) -> &str {
+        &self.builder_name
+    }
 }
diff --git a/crates/rbuilder/src/building/builders/mock_block_building_helper.rs b/crates/rbuilder/src/building/builders/mock_block_building_helper.rs
index f55f1889..26d38112 100644
--- a/crates/rbuilder/src/building/builders/mock_block_building_helper.rs
+++ b/crates/rbuilder/src/building/builders/mock_block_building_helper.rs
@@ -105,4 +105,8 @@ impl BlockBuildingHelper for MockBlockBuildingHelper {
     fn update_cached_reads(&mut self, _cached_reads: CachedReads) {
         unimplemented!()
     }
+
+    fn builder_name(&self) -> &str {
+        "Mock"
+    }
 }
diff --git a/crates/rbuilder/src/live_builder/block_output/bidding/parallel_sealer_bid_maker.rs b/crates/rbuilder/src/live_builder/block_output/bidding/parallel_sealer_bid_maker.rs
index 4f3d4eeb..2863e718 100644
--- a/crates/rbuilder/src/live_builder/block_output/bidding/parallel_sealer_bid_maker.rs
+++ b/crates/rbuilder/src/live_builder/block_output/bidding/parallel_sealer_bid_maker.rs
@@ -121,6 +121,7 @@ impl ParallelSealerBidMakerProcess {
             let payout_tx_val = bid.payout_tx_value();
             let block = bid.block();
             let block_number = block.building_context().block();
+            let builder_name = block.builder_name().to_string();
             // Take sealing "slot"
             *self.seal_control.seals_in_progress.lock() += 1;
             let seal_control = self.seal_control.clone();
@@ -129,6 +130,7 @@ impl ParallelSealerBidMakerProcess {
                 match block.finalize_block(payout_tx_val) {
                     Ok(res) => sink.new_block(res.block),
                     Err(error) => error!(
+                        builder_name,
                         block_number,
                         ?error,
                         "Error on finalize_block on ParallelSealerBidMaker"
diff --git a/crates/rbuilder/src/live_builder/block_output/bidding/sequential_sealer_bid_maker.rs b/crates/rbuilder/src/live_builder/block_output/bidding/sequential_sealer_bid_maker.rs
index 708a2be3..c41d3b4b 100644
--- a/crates/rbuilder/src/live_builder/block_output/bidding/sequential_sealer_bid_maker.rs
+++ b/crates/rbuilder/src/live_builder/block_output/bidding/sequential_sealer_bid_maker.rs
@@ -90,12 +90,14 @@ impl SequentialSealerBidMakerProcess {
             let payout_tx_val = bid.payout_tx_value();
             let block = bid.block();
             let block_number = block.building_context().block();
+            let builder_name = block.builder_name().to_string();
             match tokio::task::spawn_blocking(move || block.finalize_block(payout_tx_val)).await {
                 Ok(finalize_res) => match finalize_res {
                     Ok(res) => self.sink.new_block(res.block),
                     Err(error) => {
                         if error.is_critical() {
                             error!(
+                                builder_name,
                                 block_number,
                                 ?error,
                                 "Error on finalize_block on SequentialSealerBidMaker"
diff --git a/crates/rbuilder/src/live_builder/mod.rs b/crates/rbuilder/src/live_builder/mod.rs
index abdbd973..d4110fe8 100644
--- a/crates/rbuilder/src/live_builder/mod.rs
+++ b/crates/rbuilder/src/live_builder/mod.rs
@@ -131,6 +131,8 @@ where
     }
 
     pub async fn run(self) -> eyre::Result<()> {
+        // We keep the last block to avoid going back in time since we are now very robust about reorgs or this kind of behavior.
+        let mut last_processed_block: Option<u64> = None;
         info!("Builder block list size: {}", self.blocklist.len(),);
         info!(
             "Builder coinbase address: {:?}",
@@ -195,8 +197,13 @@ where
                 );
                 continue;
             }
+            // Allow only increasing blocks
+            if last_processed_block.map_or(false, |last_processed_block| {
+                payload.block() <= last_processed_block
+            }) {
+                continue;
+            }
             // see if we can get parent header in a reasonable time
-
             let time_to_slot = payload.timestamp() - OffsetDateTime::now_utc();
             debug!(
                 slot = payload.slot(),
@@ -235,6 +242,7 @@ where
             );
 
             inc_active_slots();
+            last_processed_block = Some(payload.block());
 
             if let Some(block_ctx) = BlockBuildingContext::from_attributes(
                 payload.payload_attributes_event.clone(),